Structurally improved MgO adsorbents derived from magnesium oxalate precursor for enhanced CO2 capture

Guo, Yanxia; Sun, Jian; Li, Weiling; Zhang, Jubing; Zhao, Chuanwen; Lu, Ping

doi:10.1016/j.fuel.2020.118379

Cited by 30 publications

(92 citation statements)

References 39 publications

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“…However, a higher pyrolysis temperature resulted in the agglomeration of MgO particles (Figure S4), thereby leading to a decrease in adsorption capacity. This result was consistent with the previous study [42].…”

Section: Effect Of Pyrolysis Temperaturesupporting

confidence: 94%

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Guo

et al. 2022

IJERPH

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Adsorption is an efficient technology for removing phosphorus from wastewater to control eutrophication. In this work, MgO-modified biochars were synthesized by a solvent-free ball milling method and used to remove phosphorus. The MgO-modified biochars had specific surface areas 20.50–212.65 m2 g−1 and pore volume 0.024–0.567 cm3 g−1. The as-prepared 2MgO/BC-450-0.5 had phosphorus adsorption capacities of 171.54 mg g−1 at 25 °C and could remove 100% of phosphorus from livestock wastewater containing 39.51 mg L−1 phosphorus. The kinetic and isotherms studied show that the pseudo-second-order model (R2 = 0.999) and Langmuir models (R2 = 0.974) could describe the adoption process well.. The thermodynamic analysis indicated that the adsorption of phosphorus on the MgO-modified biochars adsorbent was spontaneous and endothermic. The effect of pH, FTIR spectra and XPS spectra studies indicated that the phosphorus adsorption includes a protonation process, electrostatic attraction and precipitation process. This study provides a new strategy for biochar modification via a facile mechanochemical method.

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Section: Effect Of Pyrolysis Temperaturesupporting

confidence: 94%

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Guo

et al. 2022

IJERPH

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“…It suggests that the MgO from dolomite may mitigate the negative effect of higher ash content and alkaline salts introduced in the sorbents and helps to maintain the carbonation reactivity. 24,25 However, it is interesting to notice that though the ash and K 2 O and Na 2 O in D-A10-CS30-AC is higher than that in D-A10-SA30-AC, the carbonation conversion of the sorbents of D-A10-CS30-AC is still higher. This is mainly attributed to the higher content of fixed carbon in coconut shell and thereby in the sorbents D-A10-CS30-AC, that creates better microstructure for carbonation due to the decomposition.…”

Section: Effects Of Precursorsmentioning

confidence: 98%

Utilization of biomass to promote calcium‐based sorbents for CO₂capture

Liang

Chen

2021

Greenhouse Gases

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To promote and maintain the reactivity of calcium-based sorbents for CO 2 capture is essential for calcium looping technology. Biomass together with cement was doped with calcium-based sorbents pellets to promote the reactivity and enhance the sintering resistance for CO 2 capture. The influence of parameters, such as biomass types, addition, pretreatments, precursors, and cement amounts on CO 2 capture performance of sorbents are determined and an optimized process is developed for sorbents pellets making. Biomass such as coconut shell doped with calcium-based sorbents present promising enhancement in CO 2 capture capacity. Sorbents doped with pretreated biomass exhibit excellent CO 2 capture performance with a carbonation conversion of 0.6 and 0.73 after 10 cycles, respectively. The microstructures of the sorbents characterized by N 2 physisorption/desorption and the phase structure determined by in situ X-ray diffraction (XRD) are investigated as a supplement for mechanism study. The release of volatiles and pyrolysis of biomass char in sorbents are the main causes for microstructure improvement for sorbents. The formations of CaAl 2 O 4 , CaAl 4 O 7 and Ca 12 Al 14 O 33 in sorbents during the carbonation/calcination cycles account for the enhancement of the sorbents' sintering resistance.

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“…Among various alkali/ alkaline metal-based materials, MgO shows the highest theoretical CO 2 storage capacity of 1.1 g CO 2 /g adsorbent. 31,32 Nonetheless, its practical CO 2 uptake and sorption rate could be limited due to the poor textural properties, limited basic sites, and intrinsically high lattice enthalpy. 33,34 One promising strategy to improve the CO 2 sorption capacity of MgO is doping alkaline metal nitrates/nitrites and their eutectic mixtures.…”

Section: Mgco (S)mentioning

confidence: 99%

“…The backward carbonation allows the heat to be released and reused whenever needed (discharging). , As a result, the energy storage efficiency depends on the carbonation conversion. Among various alkali/alkaline metal-based materials, MgO shows the highest theoretical CO 2 storage capacity of 1.1 g CO 2 /g adsorbent. , Nonetheless, its practical CO 2 uptake and sorption rate could be limited due to the poor textural properties, limited basic sites, and intrinsically high lattice enthalpy. , …”

Section: Introductionmentioning

confidence: 99%

Alkali Metal Nitrates Promoted MgO Composites with High CO₂ Uptake for Thermochemical Energy Storage

Zhang

Zheng

Guo

et al. 2021

ACS Appl. Energy Mater.

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Thermochemical energy storage (TCES) by means of reversible chemical reactions represents a promising strategy for harnessing renewable energy and recovering industrial waste heat. In this work, alkali metal nitrate promoted MgO composites were synthesized, and the MgO−CO 2 working pair was suggested as an alternative candidate for harvesting intermediatetemperature industrial waste heat. However, it remains unclear how operating parameters would affect the heat storage density, and the long-term cycling stability of the alkali metal nitrate promoted MgO composites under harsh conditions close to practical application scenarios needs to be clarified. The objectives of this work are to expound the effects of operating parameters on TCES performance and to evaluate the long-term cycling stability of the alkali metal nitrate promoted MgO composites. With increasing NaNO 3 content, the heat storage density of NaNO 3 −MgO increases dramatically first and then exhibits no significant change. With rising carbonation temperature, the heat storage density of the 10NaNO 3 −MgO composite increases first and then declines marginally, while it increases with the increasing CO 2 partial pressure. Doping alkali metal nitrate eutectic mixtures adversely affects the heat storage density. 10NaNO 3 −MgO exhibits a high heat storage density of 2291 kJ/kg at 340 °C in 100% CO 2 . The 10NaNO 3 −MgO and 10(K−Na)NO 3 −MgO composites suffer a significant decline in heat storage density within 10 consecutive cycles, while 10(Li−Na)NO 3 −MgO retains good stability with a slight decrease of heat storage density from 1073 to 770 kJ/kg in 50% CO 2 . The desired 10(Li−Na)NO 3 −MgO is suggested as a promising material for TCES application.

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Structurally improved MgO adsorbents derived from magnesium oxalate precursor for enhanced CO2 capture

Cited by 30 publications

References 39 publications

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Utilization of biomass to promote calcium‐based sorbents for CO₂capture

Alkali Metal Nitrates Promoted MgO Composites with High CO₂ Uptake for Thermochemical Energy Storage

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Structurally improved MgO adsorbents derived from magnesium oxalate precursor for enhanced CO2 capture

Cited by 30 publications

References 39 publications

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Solvent-Free Synthesis of MgO-Modified Biochars for Phosphorus Removal from Wastewater

Utilization of biomass to promote calcium‐based sorbents for CO2capture

Alkali Metal Nitrates Promoted MgO Composites with High CO2 Uptake for Thermochemical Energy Storage

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Product

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Utilization of biomass to promote calcium‐based sorbents for CO₂capture

Alkali Metal Nitrates Promoted MgO Composites with High CO₂ Uptake for Thermochemical Energy Storage